Sewing-machine for lasting boots or shoes



(No Model.) 5 SheetsSheet 1.

T. K. KEITH.

SEWING MACHINE FOR LASTING BOOTS 0R SHOES.

No. 592,971. Patented N0v.'2, 1897.

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T. K. KEITH. SEWING MACHINE FOR LASTING BOOTS 0R SHOES.

No 592,971. Patented Nov. 2, 1897.

(No Model.) 5 Sheets-Sheet a. T. K. KEITH. SEWING MACHINE FOR LASTINGBOOTS 0R SHOES.

No. 592,971. Patented Nov. 2, 1897.

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. T. K. KEITH. SEWING MAOHINE FOR LASTING BOOTS 0R SHOES. No. 592,971.Patented Nov. 2,1897.

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' T. K. KEITH.

SEWING MACHINE FOR LASTING BOOTS OR SHOES.

No. 592,971. Patented Nov. 2,1897.

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UNITED STATES THOMAS K. KEITH, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THEKEITH- PATENT @rrrcn.

LASTING MACHINE COMPANY, OF KITTERY, MAINE.

SEWlN G-MACHlNE FOR LASTING BOOTS OR SHOES.

SPECIFICATION forming part of Letters Patent No. 592,971, dated November2, 1897.

Application filed June 8,1895. Serial No. 594,769. (No model.)

T at whom it may concern.-

Be it known that I, THOMAS K. KEITH, of Boston, county of Suifolk, Stateof Massachusetts, have invented an Improvement in Sewing- Machines forSimultaneously Lasting Boots or Shoes and Attaching \Velts, of which thefollowing description, in connection with the accompanying drawings, isa specification,

like letters and figures on the drawings representing like parts.

This invention has for its object the production of a sewing-machine bywhich the operations of lasting a boot and shoe and attaching weltthereto may be done simultaneously. This work is now commonly donemechanically at difierent times on two Inachines.

In another application, Serial No. 594,768, filed June 8, 1896, I haveshown a sewing-machine for lasting boots and shoes and herein I havecombined with mechanism substantially such as shown in said applicationmeans for presenting and attaching a welt to the upper and inner sole,and I have also provided the machine with novel feed-actuatingmechanism.

Figure 1, in front elevation, represents a sufficient portion of asewing-machine with myimprovenients added to enable myinvention to beunderstood. Fig. 2 is a top or plan view thereof; Fig. 3, a left-handside elevation; Fig. 4, a detail showing the lower end of the foot orrest which meets the sole or runs in the channel. Fig. 5 is a plan viewwith the cam-shaft and its cams and the nee die and awl actuatingdevices omitted, said view being made to show the looper and its line ofmotion. Fig. 6 is a view to the left of the dotted line to. Fig. 7 is adetail showing the awl-carrier and its awl, and Fig. 8 shows thewelt-guide removed. I

The framework, composed of a plate A, havin g suitable uprights A A tosustain the main shaft A will in practice be mounted upon a suitablebase or leg at the proper height from the floor.

The main shaft has, as herein shown, at its left-hand end asprocket-wheel B, over which is extended a suitable sprocket or otherchain B, which in turn passes about and drives a sprocket-wheel B faston a shaft B, having an attached gear B which engages a second gear 13on a shaft B having fixed bearings, the said shaft having at its innerend a bevel-gear B, meshing into a bevel-gear B feather-splined on ashaft 13 having bearings at B and 13 one of said bearings B being fixedto the framework, while the other of said bearings is fixed to ahorizontally-slidin g carriage O, the splining of the said bevelgear onthe said shaft enabling the shaft to be rotated notwithstanding thesliding mo tion given to the carriage.

The shaft 13 has at its front end a bevelgear 0, which engages abevel-gear C attached to or forming part of a moving and rubbinglasting-surface C herein shown as a rotating wheel mounted on a headedstud O and having its threaded end screwed into the bearing 13.

The carriage G has a series of ratchet-teeth G which teeth are engagedat intervals bya locking pawl or device (3, having its pivot at O andacted upon at proper times by a projection a (see Fig. 2) of the cam-hubC the upper end of said pawl being provided with a roller or other studand being kept pressed toward the said cam by means of a spring 0 Thecarriage C has at its under side a projection 0, against which acts anexpansionspring 0 suitably held in the plate A, said spring normallyacting to keep the rubbing or stretching surface (3 out against the sideof the upper on the side of the last, the carriage being free at timesto be pushed in by the action of the upper and the last in the hand ofthe operator against it, the operator putting the side of the upper onthe last against the rubbing-surface and pushing it and the carriageback until the channel part of the sole is in position with relation tothe needle and awl, to be described, to enable said needle and awl toenter the channel, and then he starts the machine, and just before theawl gets into position to enter the work the cam c retires from contactwith the pawl or locking device, letting its end engage theratchet-teeth to lock the carriage and hold it locked during theformation of the stitch, and during the feeding operation the carriageis unlocked in order that the rubbingsurfaee may adapt itself to thecontour of the last preparatory to the making of each stitch.

The rubbing-surface described constitutes a lasting mechanism or device,and it is substantially such as described in my application, Serial No.594,768, filed the 8th day of June, 1896.

The main shaft has a cam-hub D, the inner face of which is provided witha cam-groove D, (shown by dotted lines, Fig. 3,) which groove receives aroller or other stud D of an arm D fast on a short shaft D having itshearings in the fixed standard A said shaft having connected to it anarm D which by link I) is joined to the upper end of the nee dlecarrying block D, said block being mounted on a hollow stud extendedthrough the standard A and held in position by a setnut b, the saidblock having attached to it a hooked needle 6 The hollow stud referredto receives a shaft 17*, provided at its inner end with aneedlesteadying device or guide b having an eye through which the needleworks, said shaft having at its outer end an arm b having at flashed toit a spring b normally acting to keep the needle-steadying devicepressed toward the work, its movement in that direction being, however,arrested by the little projection F (see Fig. 4) on the foot or channelguide F, the said steadying device being, however, lifted about as theneedle is withdrawn from the work by contact with the clamping-plate 17connected to the needleblock. (See Fig. 6.) I

The main shaft has a cam-hub E, provided at its left-hand face with asuitable camgroove, (not shown,) in which enters a roller 01' other studE of an arm E fast on a short shaft E having its bearings in a standardA pivoted on; a stud A, located near the rear side of the machine at apoint behind the vertical plane occupied by the main shaft, the saidshort shaft E having fixed to its opposite end an arm E which by a link6 is joined to the upper end of the awl-segment E (shown separately inFig. 7,) and provided with an awl e. The awl-segmentis mounted on a stud6 having its hearings in said standard A so that the stud and the shortshaft referred to may be moved, together with the said standard, whenthe awl is in the work, the standard at such time having imparted to ita swinging movement to effect the feeding of the work. The use of thisswinging standard, pivoted at the rear side of the machine, enablesthelongitudinal sliding carriage usually employed to hold the stud onwhich the awl-segment turns to be dispensed with and enables the sewingparts to be brought together more compactly, and at the same timeaffords a proper space below the center of motion of the needle and awlin which may be presented the shoe, held in the hand of the operator, sothat the said stretching de vice may act against the upper on the sideof g the last and stretch the same preparatory to the needle enteringthe" sole, upper, and welt to unite the same together.

In this machine the awl enters first the welt and then the upper andbetween substance,

; said awl emerging from the latter in the bottom of the channel cut inthe face of the inner sole, if such channel be used.

The moving of the swinging frame carrying the awl is effected asfollows, viz: The

said frame has, as herein shown, attached to it a block E having a seatin which enters the ball-like end ll of the link E the said link beingshown as made in two parts in order that it may be adjusted as to itslength and being attached in an adjustable manner by a stud E in a slotat the upper end of an arm E having its fulcrum at E the said arm havinga roller or other stud, as E, which enters a cam-groove in the peripheryof a cam-hub E fast on the said shaft.

Attached tothe fixed frame A. is a foot or channel gage F, its lower endbeing bent, substantially as shown in Fig. 4, so as to enter the channelin the inner sole and position the shoe both vertically and horizontallywith relation to the path of the awl in order that the stitch may betaken therein at the proper depth and place, and this gage haspreferably at one side a projection F, against which, as

stated, the needle-steadying device acts when This foot or channel gageis adj ustably attached by bolts 20 to the frame A and it may beadjusted into proper in its lowest position.

position. p

The stud 8 about which the awl-carrier works, also serves to support awelt-guide G,

(shown in Fig. 6,) the said welt-guide being attached to an arm 30,provided at one end with a hole which fits over the said stud, on whichit is free to turn somewhat as it is acted upon by the shoe as thelatter is being put into position to receive the stitch, the upper edgeof said arm 30 having a cam-surface 31, which is acted upon by the freeouter end of a lever G, said lever when its acting end is in its lowerposition meeting a groove 32 and looking the welt-guide in position,this being just previous to the entrance of the awl into the welt andupper to feed the same, said weltguide acting not only to present thewelt in correct position, but also to push the welt and upper closelydown upon the outer portion or edge of the inner sole, and its move mentis in such direction as to take up any slack that may have been put intothe upper above the top of the last or the inner sole thereon by thecontinued rotation of the rubbing-surface, the said lever when itarrives at said shoulder locking the "welt-guide temporarily inposition, the pressure of the weltguide on the work being resisted bythe foot in the channel in the face of the sole, the guide and the footclamping and holding the sole and upper closely together while theneedle enters the same to make astitch. The lever G is pivoted at G andits inner end is so located as to be struck by the projection E of thecam E to lift the lever and release the welt-guide, a spring G connectedto said lever, serving the purpose of keeping its inner end normallypressed toward the said cam.

The looper cl, to furnish thread to the needie, is attached to an arm61, slotted at its outer end to receive a guide-screw d secured to alever d said arm (1 having a notch d in its side and being connected bya similar slot and stud cZ at its other end to the under side of saidlever C1 The lever d is pivoted at d in the forked end of a rock-shaftd, having attached to its outer or left-hand end an arm al to which isconnecteda spring (i attached to the framework, the spring normallyturning the rock-shaft in a direction to keep the outer end of the lever61 and the attached thread-guide down in its lower position. The innerend of the lever 01 has a roller or other stud d", which enters thecam-groove 61 in a cam-hub 0 attached to the main shaft. The notch d inthe side of the arm cl is entered by the rounded end of arm f, connectedto a rock-shaftf having at its right-hand end an arm f provided with astud which enters a slot at the lower end of a lever f pivoted on a studf of an upright f, said lever having at its upper end a roller or otherstud f which is acted upon by a cam f fast to the right-hand side of thecam-hub E. A suitable spring f", connected to the said lever and theframework, acts to keep the said lever against the said cam f so thatthe rock-shaft f 2 is moved positively. The arm f, engaging the notch inthe arm (1, moves the looper longitudinally on the lever (i and the saidlooper has movements imparted to it about the pivot (1 and the roller dis also rocked with the rock-shaft, so that the looper has given to it acompound circular movement and a backward and forward movement,(indicated by the dotted lines in Fig. 5.) The rocking movement of thelever (Z about the pivot d is imparted by the cam projections (Z (Z ofthe cam (J acting upon the roll 03 on the rear end of the lever (1 thecombined longitudinal sliding movement and the vertical and horizontalrocking movements of said lever 61 causing the thread carried by thelooper d to be looped about the needle at the proper time.

lhe cam-hub D has attached to it at one side a cam m, which in therotation of the main shaft acts on a roller or other studm, carried byan arm m fixed to a rock-shaft hi having its bearings in the fixed frameA the said rock shaft having a second arm m provided at its lower endwith a threadsheave m about which the thread going to the looper andneedle is wound, the said thread being passed through the hole n in thelever 61 (See Fig. 5.)

The thread coming from the wax-pot or other usual source of supply (notshown) is passed around the tension-wheel m and then under and about asheave m", and thence about the sheave m, as stated, and led to thelooper. The tension-wheel at has fixed to or forming part of it aratchet-wheel m which is acted upon by a spring-pressed pawl m the pawlholding the ratchet-wheel and tension device locked, but at each inwardmovement of the lever m in the direction of the arrow the lower end ofthe said lever meets one end of the said pawl and releases the pawl toallow the tension device to turn.

The cam in will be of such suitable shape as to move the take-up in suchtime and order as to give up thread to the needle while the latter isdrawing the loop through the material and to lock it before thecompletion of the stitch at the outward movement of the thread in orderthat the needle-thread may be drawn in to complete the last or previousstitch made.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1.. In a sewing-machine for lasting boots and shoes, the followinginstrumentalities, viz: stitch-forming mechanism, including a hookedneedle and a looper, a segment, a curved awl attached thereto, a pivotedhorizontal swinging standard having a stud to serve as a center ofmotion of said awl-segment, a shaft having its hearings in said swingingframe, connections between it and said awl-segment, a cam and meansintermediate it and said shaft to rock the latter, means to swing thesaid frame while the and is in the material, and a continuously-rotating rubbing-surface to act on the upper at the side of the last andstretch and feed the same to the last both preparatory to and during thestitching and feeding operation and a guide to present a welt to theupper, that it may be stitched thereto and to the sole, substantially asdescribed.

2. In a machine of the class described, the combination with a hookedneedle,of a looper, a lever to which it is attached, a second leverpivotally mounted on a rock-shaft, means to I oscillate said rock-shaftand means to vibrate said lever on its pivot on said rock-shaft, andmeans to slide the lever to which the looper is attached on the saidsecond lever, whereby the looper is given an irregular movement inpresenting its thread to the needle, substantially as described.

3. In a machine of the class described, a hooked needle, means tooperate it, a channel guide and foot having at one side a projection,combined with a needle-steadying device and a spring to move it, thesaid projection determining the descent of the said needle-steadyingdevice, substantially as described.

4:. In a sewing-machine for lasting boots and shoes, an awl-segmentprovided with an awl, a pivoted horizontally-swinging standard, a studmounted in said standard and serving as the center of motion for saidand- IIO segment, a short shaft also mounted in said standard, meansbetween said short shaft and said segment to operate the same, a cam anddevices actuated thereby to rock said short shaft, and devices connectedto said standard to vibrate the same about its pivot, while the awl isinthe work, substantially as described.

5. In a machine for lasting boots and shoes, a circularly-movable curvedhooked needle, of means'to actuate it, a constantly-rotating rubbingdevice to act against and stretch the upper over the side of the last,and a weltguide carrier comprising an arm mounted to turn about the axisof motion of the said needle, said arm being provided between the

